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Published Sep. 10, 2025

Implicit connection cache issue

Written By

Thanga Meena

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Issue

  • Looking into the thread dumps, few threads were getting stuck as below with OracleImplicitConnectionCache and running out of implicit connection cache issue 
tomcat-http--300 - priority:5 - threadId:0x00007f6ac4286000 - nativeId:0x960 - nativeId (decimal):2400 - state:TIMED_WAITING
stackTrace:
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at oracle.jdbc.pool.OracleImplicitConnectionCache.processConnectionWaitTimeout(OracleImplicitConnectionCache.java:3050)
- locked <0x000000072f081790> (a oracle.jdbc.pool.OracleImplicitConnectionCache)
at oracle.jdbc.pool.OracleImplicitConnectionCache.getConnection(OracleImplicitConnectionCache.java:388)
at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:428)
at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:202)

Environment

  • Liferay portal 6.2EE
  • Oracle Database 12c

Resolution

Kindly note, the provided unofficial links are not the official documentation from Liferay, you can choose to use and follow these at your discretion by connecting with your DB or technical team.

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